Hello everyone! + tiny question with case statement

Hi everyone,
I join this community in the spirit that hopefully I can help (at least where I can) and learn. I feel a bit like a noob not knowing the actual formalities when joining a forum such as this but basically I started learning ruby this semester and I have found it strangely addictive.

Oh, with the tiny question...

I have a script that is basically as such:
#used to readjust dates when months are days are added to it